There is one other possibility here
That he really likes it here. That he thinks he's going to be really good again but worries teams want to see more before they jump all over him..
The Jays may have been talking to him about relatively team friendly three or four year extension. But instead of doing that he wants to stay and have a really big seaon next year in a place he's comfortable and build himself up for an even better contract next off season, rather than signing one now that he might regret.